Three elements 'X', 'Y' and 'Z' have atomic numbers 18, 19 and 20 respectively. How many electrons are present in the M shell of these elements?

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : has four electrons in the valency shell ?

The atomic number of an element M is 20. How many electrons are present in the M-shell of the element in its M^(3+) state ?

The atomic number of an element M is 26. How many electrons are present in the M-shell of the element in its M^(3+) state

The atomic number of an element M is 26. How many electrons are present in the M-shell of the element in its M^(3+) state

The atomic number of an element 'M' is 26. How many electrons are present in the M-shell of the element in its M^(3+) state ?

Three elements X , Y and Z have atomic numbers 19 , 37 and 55 respectively . Then the correct statements (s) is / are

The atomic numbers of elements X,Y ,and Z are 19,21 , and 23 , respectively. The number of electron present in the M shells of these elements follows the order